ci starts bisection 2023-12-22 11:55:08.778680982 +0000 UTC m=+128471.354953425 bisecting cause commit starting from 7c5e046bdcb2513f9decb3765d8bf92d604279cf building syzkaller on 4f9530a3b62297342999c9097c77dde726522618 ensuring issue is reproducible on original commit 7c5e046bdcb2513f9decb3765d8bf92d604279cf testing commit 7c5e046bdcb2513f9decb3765d8bf92d604279cf gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: fb44565e8be6652cc9c7d2f6654c90d1522e7bb5e1df205fe4889292ad8d02d7 all runs: crashed: WARNING in skb_checksum_help representative crash: WARNING in skb_checksum_help, types: [WARNING] check whether we can drop unnecessary instrumentation disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit 7c5e046bdcb2513f9decb3765d8bf92d604279cf gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 88fccdbcaf18af520656e28115546b83d33b184861aa6609f6b4489170b272d6 all runs: crashed: WARNING in skb_checksum_help representative crash: WARNING in skb_checksum_help, types: [WARNING] the bug reproduces without the instrumentation disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed kconfig minimization: base=3923 full=7658 leaves diff=2005 split chunks (needed=false): <2005> split chunk #0 of len 2005 into 5 parts testing without sub-chunk 1/5 disabling configs for [HANG LEAK UBSAN KASAN LOCKDEP ATOMIC_SLEEP], they are not needed testing commit 7c5e046bdcb2513f9decb3765d8bf92d604279cf gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 5ae855397de81a58bcadeca88922d999589efed8db2533ed47fa61c14d4a44d3 all runs: crashed: WARNING in skb_checksum_help representative crash: WARNING in skb_checksum_help, types: [WARNING] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [LEAK UBSAN KASAN LOCKDEP ATOMIC_SLEEP HANG], they are not needed testing commit 7c5e046bdcb2513f9decb3765d8bf92d604279cf gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4951ca0a8a544f90ad67ac8357db89f6dea88fb1ab3f480cb15479af60728bb1 all runs: crashed: WARNING in skb_checksum_help representative crash: WARNING in skb_checksum_help, types: [WARNING] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [HANG LEAK UBSAN KASAN LOCKDEP ATOMIC_SLEEP], they are not needed testing commit 7c5e046bdcb2513f9decb3765d8bf92d604279cf gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a973abf6aca06337c277ad0054096067adb939046d5b27f7b015e71c3a6dc73e all runs: crashed: WARNING in skb_checksum_help representative crash: WARNING in skb_checksum_help, types: [WARNING] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN KASAN], they are not needed testing commit 7c5e046bdcb2513f9decb3765d8bf92d604279cf gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 90d78efc73acfc507b7c6e6c08dd3b107357225782b74b52966337ddf3d33314 all runs: OK false negative chance: 0.000 testing without sub-chunk 5/5 disabling configs for [KASAN LOCKDEP ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed testing commit 7c5e046bdcb2513f9decb3765d8bf92d604279cf gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 14a87bf14232c159d8afd3e816afd337eadbf4bc7c49f73f71f95eb12f91e4a4 all runs: OK false negative chance: 0.000 minimized to 802 configs; suspects: [AF_RXRPC ARCH_ENABLE_MEMORY_HOTREMOVE ATM AX25 BCMA BLK_DEV_ZONED BPF_SYSCALL CARDBUS CFG80211 CFG80211_WEXT CMA COMMON_CLK CONTIG_ALLOC CRYPTO_842 CRYPTO_LZ4 CRYPTO_LZ4HC CRYPTO_LZO CRYPTO_ZSTD DAX DLM DVB_CORE ENCRYPTED_KEYS EXTCON FB GENEVE GPIOLIB HAMRADIO HAVE_CLK HID_SENSOR_HUB HID_SMARTJOYPLUS HID_THRUSTMASTER HID_ZEROPLUS I2C_MUX IIO INFINIBAND INFINIBAND_ADDR_TRANS INFINIBAND_IPOIB INFINIBAND_USER_ACCESS INFINIBAND_VIRT_DMA INPUT_TABLET INPUT_TOUCHSCREEN IOMMUFD IP_SCTP IRQ_REMAP KVM KVM_INTEL L2TP LIBNVDIMM MEDIA_ANALOG_TV_SUPPORT MEDIA_CAMERA_SUPPORT MEDIA_CEC_SUPPORT MEDIA_COMMON_OPTIONS MEDIA_CONTROLLER MEDIA_DIGITAL_TV_SUPPORT MEDIA_RADIO_SUPPORT MEDIA_SDR_SUPPORT MEDIA_SUPPORT MEDIA_TEST_SUPPORT MEDIA_USB_SUPPORT MEMORY_HOTPLUG MEMORY_HOTREMOVE MFD_DLN2 MFD_RETU MFD_VIPERBOARD MMC MTD MTD_UBI NETFILTER_CONNCOUNT NET_IPGRE NET_IPGRE_DEMUX NFS_V4_1 NF_SOCKET_IPV4 NF_SOCKET_IPV6 NF_TABLES NF_TABLES_ARP NF_TPROXY_IPV4 NF_TPROXY_IPV6 NILFS2_FS NLMON NLS_CODEPAGE_1250 NLS_CODEPAGE_1251 NLS_CODEPAGE_737 NLS_CODEPAGE_775 NLS_CODEPAGE_850 NLS_CODEPAGE_852 NLS_CODEPAGE_855 NLS_CODEPAGE_857 NLS_CODEPAGE_860 NLS_CODEPAGE_861 NLS_CODEPAGE_862 NLS_CODEPAGE_863 NLS_CODEPAGE_864 NLS_CODEPAGE_865 NLS_CODEPAGE_866 NLS_CODEPAGE_869 NLS_CODEPAGE_874 NLS_CODEPAGE_932 NLS_CODEPAGE_936 NLS_CODEPAGE_949 NLS_CODEPAGE_950 NLS_ISO8859_13 NLS_ISO8859_14 NLS_ISO8859_15 NLS_ISO8859_2 NLS_ISO8859_3 NLS_ISO8859_4 NLS_ISO8859_5 NLS_ISO8859_6 NLS_ISO8859_7 NLS_ISO8859_8 NLS_ISO8859_9 NLS_KOI8_R NLS_KOI8_U NLS_MAC_CELTIC NLS_MAC_CENTEURO NLS_MAC_CROATIAN NLS_MAC_CYRILLIC NLS_MAC_GAELIC NLS_MAC_GREEK NLS_MAC_ICELAND NLS_MAC_INUIT NLS_MAC_ROMAN NLS_MAC_ROMANIAN NLS_MAC_TURKISH NLS_UCS2_UTILS NOP_USB_XCEIV NOZOMI NTFS3_FS NTFS3_FS_POSIX_ACL NTFS3_LZX_XPRESS NTFS_FS NTFS_RW NULL_TTY NUMA_BALANCING NUMA_BALANCING_DEFAULT_ENABLED NUMA_EMU NUMA_KEEP_MEMINFO NVDIMM_DAX NVDIMM_KEYS NVDIMM_PFN NVME_CORE NVME_FABRICS NVME_FC NVME_MULTIPATH NVME_RDMA NVME_TARGET NVME_TARGET_FC NVME_TARGET_FCLOOP NVME_TARGET_LOOP NVME_TARGET_RDMA NVME_TARGET_TCP NVME_TCP N_GSM N_HDLC OCFS2_DEBUG_FS OCFS2_FS OCFS2_FS_O2CB OCFS2_FS_STATS OCFS2_FS_USERSPACE_CLUSTER OF_GPIO OF_PMEM OMFS_FS OPENVSWITCH OPENVSWITCH_GENEVE OPENVSWITCH_GRE OPENVSWITCH_VXLAN ORANGEFS_FS OSF_PARTITION OVERLAY_FS OVERLAY_FS_DEBUG OVERLAY_FS_INDEX OVERLAY_FS_REDIRECT_ALWAYS_FOLLOW OVERLAY_FS_REDIRECT_DIR PACKET_DIAG PADATA PAGE_IDLE_FLAG PAGE_POOL PAGE_REPORTING PAHOLE_HAS_LANG_EXCLUDE PAHOLE_HAS_SPLIT_BTF PARPORT PARPORT_NOT_PC PARTITION_ADVANCED PCCARD PCCARD_NONSTATIC PCIEAER PCI_ENDPOINT PCI_IOV PCMCIA PCMCIA_LOAD_CIS PERCPU_STATS PERSISTENT_KEYRINGS PHONET PHYLINK PHY_CPCAP_USB PHY_QCOM_USB_HS PHY_QCOM_USB_HSIC PHY_SAMSUNG_USB2 PHY_TUSB1210 PKCS7_TEST_KEY PKCS8_PRIVATE_KEY_PARSER PM_CLK PNFS_BLOCK PNFS_FILE_LAYOUT PNFS_FLEXFILE_LAYOUT PPP PPPOATM PPPOE PPPOE_HASH_BITS_4 PPPOL2TP PPP_ASYNC PPP_BSDCOMP PPP_DEFLATE PPP_FILTER PPP_MPPE PPP_MULTILINK PPP_SYNC_TTY PPTP PREEMPT PREEMPT_NOTIFIERS PRISM2_USB PROC_CHILDREN PSI PSTORE PSTORE_COMPRESS QCOM_QMI_HELPERS QNX4FS_FS QNX6FS_FS QRTR QRTR_TUN R8712U RADIO_ADAPTERS RADIO_SHARK RADIO_SHARK2 RADIO_SI470X RADIO_SI4713 RADIO_TEA575X RAID6_PQ RAID_ATTRS RC_ATI_REMOTE RC_CORE RC_DEVICES RDMA_RXE RDMA_SIW RDS RDS_RDMA RDS_TCP READ_ONLY_THP_FOR_FS REALTEK_AUTOPM REED_SOLOMON REED_SOLOMON_DEC8 REGMAP REGMAP_I2C REGMAP_IRQ REGMAP_MMIO REGULATOR REGULATOR_TWL4030 REISERFS_FS REISERFS_FS_POSIX_ACL REISERFS_FS_SECURITY REISERFS_FS_XATTR REISERFS_PROC_INFO RESET_CONTROLLER RFKILL RFKILL_INPUT RFKILL_LEDS RMI4_2D_SENSOR RMI4_CORE RMI4_F03 RMI4_F03_SERIO RMI4_F11 RMI4_F12 RMI4_F30 ROMFS_BACKED_BY_BOTH ROMFS_FS ROMFS_ON_BLOCK ROMFS_ON_MTD ROSE RTC_DRV_HID_SENSOR_TIME RXKAD SCHED_CORE SCSI_FC_ATTRS SCSI_HPSA SCSI_ISCSI_ATTRS SCSI_LOGGING SCSI_NETLINK SCSI_SAS_ATA SCSI_SAS_ATTRS SCSI_SAS_LIBSAS SCSI_SCAN_ASYNC SCSI_SRP_ATTRS SCTP_COOKIE_HMAC_MD5 SCTP_COOKIE_HMAC_SHA1 SCTP_DEFAULT_COOKIE_HMAC_MD5 SECONDARY_TRUSTED_KEYRING SECURITY_INFINIBAND SECURITY_NETWORK_XFRM SERIAL_DEV_BUS SERIAL_DEV_CTRL_TTYPORT SERIAL_MCTRL_GPIO SGI_PARTITION SIGNATURE SIGNED_PE_FILE_VERIFICATION SLHC SLIP SLIP_COMPRESSED SLIP_MODE_SLIP6 SLIP_SMART SMARTJOYPLUS_FF SMBFS SMC SMC_DIAG SMSC_PHY SMS_SIANO_MDTV SMS_SIANO_RC SMS_USB_DRV SND SND_ALOOP SND_BCD2000 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TCP_CONG_HYBLA TCP_CONG_ILLINOIS TCP_CONG_LP TCP_CONG_NV TCP_CONG_SCALABLE TCP_CONG_VEGAS TCP_CONG_VENO TCP_CONG_WESTWOOD TCP_CONG_YEAH TEXTSEARCH TEXTSEARCH_BM TEXTSEARCH_FSM TEXTSEARCH_KMP THERMAL_NETLINK THP_SWAP THRUSTMASTER_FF TIPC TIPC_CRYPTO TIPC_DIAG TIPC_MEDIA_IB TIPC_MEDIA_UDP TLS TLS_TOE TMPFS_QUOTA TOUCHSCREEN_SUR40 TOUCHSCREEN_USB_3M TOUCHSCREEN_USB_COMPOSITE TOUCHSCREEN_USB_DMC_TSC10 TOUCHSCREEN_USB_E2I TOUCHSCREEN_USB_EASYTOUCH TOUCHSCREEN_USB_EGALAX TOUCHSCREEN_USB_ELO TOUCHSCREEN_USB_ETT_TC45USB TOUCHSCREEN_USB_ETURBO TOUCHSCREEN_USB_GENERAL_TOUCH TOUCHSCREEN_USB_GOTOP TOUCHSCREEN_USB_GUNZE TOUCHSCREEN_USB_IDEALTEK TOUCHSCREEN_USB_IRTOUCH TOUCHSCREEN_USB_ITM TOUCHSCREEN_USB_JASTEC TOUCHSCREEN_USB_NEXIO TOUCHSCREEN_USB_PANJIT TOUCHSCREEN_USB_ZYTRONIC TRANSPARENT_HUGEPAGE TRANSPARENT_HUGEPAGE_MADVISE TTPCI_EEPROM TTY_PRINTK TUN TUN_VNET_CROSS_LE TWL4030_CORE TYPEC TYPEC_FUSB302 TYPEC_TCPCI TYPEC_TCPM TYPEC_TPS6598X TYPEC_UCSI UBIFS_ATIME_SUPPORT UBIFS_FS 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USB_SERIAL_EMPEG USB_SERIAL_F81232 USB_SERIAL_F8153X USB_SERIAL_FTDI_SIO USB_SERIAL_GARMIN USB_SERIAL_GENERIC USB_SERIAL_IPAQ USB_SERIAL_IPW USB_SERIAL_IR USB_SERIAL_IUU USB_SERIAL_KEYSPAN USB_SERIAL_KEYSPAN_PDA USB_SERIAL_KLSI USB_SERIAL_KOBIL_SCT USB_SERIAL_MCT_U232 USB_SERIAL_METRO USB_SERIAL_MOS7715_PARPORT USB_SERIAL_MOS7720 USB_SERIAL_MOS7840 USB_SERIAL_MXUPORT USB_SERIAL_NAVMAN USB_SERIAL_OMNINET USB_SERIAL_OPTICON USB_SERIAL_OPTION USB_SERIAL_OTI6858 USB_SERIAL_PL2303 USB_SERIAL_QCAUX USB_SERIAL_QT2 USB_SERIAL_QUALCOMM USB_SERIAL_SAFE USB_SERIAL_SIERRAWIRELESS USB_SERIAL_SIMPLE USB_SERIAL_SPCP8X5 USB_SERIAL_SSU100 USB_SERIAL_SYMBOL USB_SERIAL_TI USB_SERIAL_UPD78F0730 USB_SERIAL_VISOR USB_SERIAL_WHITEHEAT USB_SERIAL_WISHBONE USB_SERIAL_WWAN USB_SERIAL_XR USB_SERIAL_XSENS_MT USB_SEVSEG USB_SI470X USB_SI4713 USB_SIERRA_NET USB_SISUSBVGA USB_SL811_CS USB_SL811_HCD USB_SL811_HCD_ISO USB_SNP_CORE USB_SPEEDTOUCH USB_STORAGE_ALAUDA USB_STORAGE_CYPRESS_ATACB USB_STORAGE_DATAFAB USB_STORAGE_ENE_UB6250 USB_STORAGE_FREECOM USB_STORAGE_ISD200 USB_STORAGE_JUMPSHOT USB_STORAGE_KARMA USB_STORAGE_ONETOUCH USB_STORAGE_REALTEK USB_STORAGE_SDDR09 USB_STORAGE_SDDR55 USB_STORAGE_USBAT USB_STV06XX USB_TEST USB_TMC USB_TRANCEVIBRATOR USB_UAS USB_UEAGLEATM USB_ULPI_BUS USB_USBNET USB_USS720 USB_U_AUDIO USB_U_ETHER USB_U_SERIAL USB_VIDEO_CLASS USB_VIDEO_CLASS_INPUT_EVDEV USB_VL600 USB_WDM USB_XHCI_DBGCAP USB_XHCI_PLATFORM USB_XUSBATM USB_YUREX USERFAULTFD USERIO USERMODE_DRIVER USER_RETURN_NOTIFIER UVC_COMMON U_SERIAL_CONSOLE V4L2_MEM2MEM_DEV V4L_TEST_DRIVERS VALIDATE_FS_PARSER VDPA VDPA_SIM VDPA_SIM_BLOCK VDPA_SIM_NET VDPA_USER VETH VFIO VFIO_DEVICE_CDEV VFIO_PCI VFIO_PCI_CORE VFIO_PCI_INTX VFIO_PCI_MMAP VFIO_VIRQFD VGASTATE VHOST VHOST_CROSS_ENDIAN_LEGACY VHOST_IOTLB VHOST_NET VHOST_RING VHOST_TASK VHOST_VDPA VHOST_VSOCK VIDEOBUF2_CORE VIDEOBUF2_DMA_CONTIG VIDEOBUF2_DMA_SG VIDEOBUF2_MEMOPS VIDEOBUF2_V4L2 VIDEOBUF2_VMALLOC VIDEOMODE_HELPERS VIDEO_AU0828 VIDEO_AU0828_RC VIDEO_AU0828_V4L2 VIDEO_CMDLINE VIDEO_CS53L32A VIDEO_CX231XX VIDEO_CX231XX_ALSA VIDEO_CX231XX_DVB VIDEO_CX231XX_RC VIDEO_CX2341X VIDEO_CX25840 VIDEO_DEV VIDEO_EM28XX VIDEO_EM28XX_ALSA VIDEO_EM28XX_DVB VIDEO_EM28XX_RC VIDEO_EM28XX_V4L2 VIDEO_GO7007 VIDEO_GO7007_LOADER VIDEO_GO7007_USB VIDEO_GO7007_USB_S2250_BOARD VIDEO_HDPVR VIDEO_MSP3400 VIDEO_NOMODESET VIDEO_PVRUSB2 VIDEO_PVRUSB2_DVB VIDEO_PVRUSB2_SYSFS VIDEO_SAA711X VIDEO_STK1160 VIDEO_TUNER VIDEO_TVEEPROM VIDEO_USBTV VIDEO_V4L2_I2C VIDEO_V4L2_SUBDEV_API VIDEO_V4L2_TPG VIDEO_VICODEC VIDEO_VIM2M VIDEO_VIMC VIDEO_VIVID VIDEO_VIVID_CEC VIDEO_WM8775 VIPERBOARD_ADC VIRTIO_BALLOON VIRTIO_DMA_SHARED_BUFFER VIRTIO_MEM VIRTIO_MMIO VIRTIO_MMIO_CMDLINE_DEVICES VIRTIO_PMEM VIRTIO_VDPA VIRTIO_VSOCKETS VIRTIO_VSOCKETS_COMMON VIRT_WIFI VLAN_8021Q VLAN_8021Q_GVRP VLAN_8021Q_MVRP VMAP_PFN VMWARE_VMCI VMXNET3 VP_VDPA VSOCKETS VSOCKETS_DIAG VSOCKETS_LOOPBACK VSOCKMON VT_HW_CONSOLE_BINDING VXFS_FS VXLAN WANT_DEV_COREDUMP WEXT_CORE WEXT_PRIV WEXT_PROC WIREGUARD WIRELESS WIRELESS_EXT WLAN WLAN_VENDOR_ADMTEK WLAN_VENDOR_PURELIFI WLAN_VENDOR_SILABS X86_SGX X86_SGX_KVM X86_USER_SHADOW_STACK X86_X2APIC X86_X32_ABI XARRAY_MULTI XDP_SOCKETS XDP_SOCKETS_DIAG XFRM_ESPINTCP XFRM_INTERFACE XFRM_IPCOMP XFRM_MIGRATE XFRM_OFFLOAD XFRM_STATISTICS XFRM_SUB_POLICY XFRM_USER_COMPAT XFS_FS XFS_POSIX_ACL XFS_QUOTA XFS_RT XOR_BLOCKS YENTA YENTA_ENE_TUNE YENTA_O2 YENTA_RICOH YENTA_TI YENTA_TOSHIBA ZEROPLUS_FF ZLIB_DEFLATE ZONEFS_FS ZONE_DEVICE ZPOOL ZRAM ZRAM_DEF_COMP_LZORLE ZSMALLOC ZSTD_COMPRESS ZSWAP ZSWAP_COMPRESSOR_DEFAULT_LZO ZSWAP_DEFAULT_ON ZSWAP_ZPOOL_DEFAULT_ZSMALLOC] disabling configs for [HANG LEAK UBSAN KASAN LOCKDEP ATOMIC_SLEEP], they are not needed picked [v6.6 v6.5 v6.4 v6.2 v6.0 v5.18 v5.16 v5.14 v5.11 v5.8 v5.5 v5.2 v4.20 v4.19] out of 29 release tags testing release v6.6 testing commit ffc253263a1375a65fa6c9f62a893e9767fbebfa gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 813fbca1641cc749006612b517c872024c078edc3ecb3d7e1b755f5dd7f253fd all runs: crashed: WARNING in skb_checksum_help representative crash: WARNING in skb_checksum_help, types: [WARNING] testing release v6.5 testing commit 2dde18cd1d8fac735875f2e4987f11817cc0bc2c gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8c24dff4ff9741ef835328c1a008db16a2a60cfd799b8e470722be6d5b0ade8c all runs: crashed: WARNING in skb_checksum_help representative crash: WARNING in skb_checksum_help, types: [WARNING] testing release v6.4 testing commit 6995e2de6891c724bfeb2db33d7b87775f913ad1 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: eac7f6c0db50fc70f4aaa15987d0ff4dc75a1ed4ccfbe219f7adb9dc9e49c5bb all runs: crashed: WARNING in skb_checksum_help representative crash: WARNING in skb_checksum_help, types: [WARNING] testing release v6.2 testing commit c9c3395d5e3dcc6daee66c6908354d47bf98cb0c gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 12bca77e4f81afbafacf6ceec546f694a3d8830931717fd4ca28eb0b58a666dd all runs: crashed: WARNING in skb_checksum_help representative crash: WARNING in skb_checksum_help, types: [WARNING] testing release v6.0 testing commit 4fe89d07dcc2804c8b562f6c7896a45643d34b2f gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 26a3c5ef867a038c3bcba1e91c78056227b2a09a0e678a010ac82a5ba0df038f all runs: crashed: WARNING in skb_checksum_help representative crash: WARNING in skb_checksum_help, types: [WARNING] testing release v5.18 testing commit 4b0986a3613c92f4ec1bdc7f60ec66fea135991f gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 6b7af0bf2af95de3f4c108d31953e40a61cfee3e606a6c5a52a65e5520461b14 all runs: crashed: kernel BUG in ip_do_fragment representative crash: kernel BUG in ip_do_fragment, types: [BUG] testing release v5.16 testing commit df0cc57e057f18e44dac8e6c18aba47ab53202f9 gcc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b1feab36d8d6ee7fc743543960510484ee8cdb37eb34dac6aedbb6e0e6cb05d2 all runs: crashed: kernel BUG in ip_do_fragment representative crash: kernel BUG in ip_do_fragment, types: [BUG] testing release v5.14 testing commit 7d2a07b769330c34b4deabeed939325c77a7ec2f gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 3dceeefce46fab7620dfc9209fa9add57242fb698ffdd8ffd3997c24eaae81f8 all runs: crashed: kernel BUG in ip_do_fragment representative crash: kernel BUG in ip_do_fragment, types: [BUG] testing release v5.11 testing commit f40ddce88593482919761f74910f42f4b84c004b gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 931e7c31efc8d0393f577c4c2227797f2112c364a2bf1297dcccf5a9fc65885f all runs: OK false negative chance: 0.000 # git bisect start 7d2a07b769330c34b4deabeed939325c77a7ec2f f40ddce88593482919761f74910f42f4b84c004b Bisecting: 24610 revisions left to test after this (roughly 15 steps) [85f3f17b5db2dd9f8a094a0ddc665555135afd22] Merge branch 'md-fixes' of https://git.kernel.org/pub/scm/linux/kernel/git/song/md into block-5.13 testing commit 85f3f17b5db2dd9f8a094a0ddc665555135afd22 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 26ea9480f58f7844bc60fa8ca23781e72892bbcf0cba5be74c2218a989053db8 all runs: crashed: kernel BUG in ip_do_fragment representative crash: kernel BUG in ip_do_fragment, types: [BUG] # git bisect bad 85f3f17b5db2dd9f8a094a0ddc665555135afd22 Bisecting: 11313 revisions left to test after this (roughly 14 steps) [e216674a5b5781694223ff3f0c4f2cc721a36ab0] Merge branch '10GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/net-queue testing commit e216674a5b5781694223ff3f0c4f2cc721a36ab0 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b32d806017864aaeb7a452a9e66f5085b2ccb71dd702d429599fd58bac474d20 all runs: OK false negative chance: 0.000 # git bisect good e216674a5b5781694223ff3f0c4f2cc721a36ab0 Bisecting: 5586 revisions left to test after this (roughly 13 steps) [37f00ab4a003f371f81e0eae76cf372f06dec780] Merge tag 'arm-drivers-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc testing commit 37f00ab4a003f371f81e0eae76cf372f06dec780 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f67cddd8251caf53557909594bdfa0ccca42461a7f01a7d6dfa3e4dc05a9f65b all runs: crashed: kernel BUG in ip_do_fragment representative crash: kernel BUG in ip_do_fragment, types: [BUG] # git bisect bad 37f00ab4a003f371f81e0eae76cf372f06dec780 Bisecting: 2865 revisions left to test after this (roughly 12 steps) [24dfc390079c5bda43a689d8b83812ce308e1e07] Merge tag 'perf_urgent_for_v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip testing commit 24dfc390079c5bda43a689d8b83812ce308e1e07 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 95b9a1856970596f034208c697cb0dfb4109bbbd0be580276628934a704fd6ec all runs: crashed: kernel BUG in ip_do_fragment representative crash: kernel BUG in ip_do_fragment, types: [BUG] # git bisect bad 24dfc390079c5bda43a689d8b83812ce308e1e07 Bisecting: 1432 revisions left to test after this (roughly 11 steps) [769e155c5395100fc468aa87703c486f276c16cd] Merge tag 'sound-5.12-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound testing commit 769e155c5395100fc468aa87703c486f276c16cd gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 72315e859fe279a3ac232700a0490d5751b7fe07a16f4e7bf70cfc38b6813121 run #0: OK run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: boot failed: WARNING in kvm_wait false negative chance: 0.000 # git bisect good 769e155c5395100fc468aa87703c486f276c16cd Bisecting: 719 revisions left to test after this (roughly 10 steps) [57fbdb15ec427ca3a6f35d4b71fc90ca9af301ea] Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi testing commit 57fbdb15ec427ca3a6f35d4b71fc90ca9af301ea gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f72d122cebe721c2b7e486687f580be24be1be33faf6617b1d9eaf19a6d5c1c2 all runs: OK false negative chance: 0.000 # git bisect good 57fbdb15ec427ca3a6f35d4b71fc90ca9af301ea Bisecting: 308 revisions left to test after this (roughly 9 steps) [4e04e7513b0fa2fe8966a1c83fb473f1667e2810] Merge tag 'net-5.12-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net testing commit 4e04e7513b0fa2fe8966a1c83fb473f1667e2810 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b4ae9021ace5e94fb0e263710a5de8591cdf8887f352554e0fdf7c280cb877d1 all runs: crashed: kernel BUG in ip_do_fragment representative crash: kernel BUG in ip_do_fragment, types: [BUG] # git bisect bad 4e04e7513b0fa2fe8966a1c83fb473f1667e2810 Bisecting: 205 revisions left to test after this (roughly 8 steps) [3bc41d6d2721d5168a8f7fea34028a5332068f5e] lan743x: fix ethernet frame cutoff issue testing commit 3bc41d6d2721d5168a8f7fea34028a5332068f5e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: f5d1d220cdac666bde48b880cd904655d5b47ed19326d8b8686e71fa2a1f7f26 all runs: crashed: kernel BUG in ip_do_fragment representative crash: kernel BUG in ip_do_fragment, types: [BUG] # git bisect bad 3bc41d6d2721d5168a8f7fea34028a5332068f5e Bisecting: 101 revisions left to test after this (roughly 7 steps) [29684d802e4ab484c679859217c1588c199f1d4f] Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf testing commit 29684d802e4ab484c679859217c1588c199f1d4f gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: df9256b9bb54d28b47e81d6db80ac6ad43b9c80279091a833da1d53b296ce31e all runs: OK false negative chance: 0.000 # git bisect good 29684d802e4ab484c679859217c1588c199f1d4f Bisecting: 56 revisions left to test after this (roughly 6 steps) [107adc694558dd51c35fca07b025c2fe2168afb5] Merge tag 'wireless-drivers-2021-04-07' of git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers testing commit 107adc694558dd51c35fca07b025c2fe2168afb5 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 19adb509dd9a88d9fb00ccf7483433a46a2f5d15224a447c46f6cb4ca9427615 all runs: crashed: kernel BUG in ip_do_fragment representative crash: kernel BUG in ip_do_fragment, types: [BUG] # git bisect bad 107adc694558dd51c35fca07b025c2fe2168afb5 Bisecting: 21 revisions left to test after this (roughly 5 steps) [cd90437399a24ae783b9a3a1a50fe8ee2b717355] Merge branch 'ethtool-doc' testing commit cd90437399a24ae783b9a3a1a50fe8ee2b717355 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4bd4d9527f84c84f899f608cb45745cd999926302f36eed70bf6d4b6c1813813 all runs: crashed: kernel BUG in ip_do_fragment representative crash: kernel BUG in ip_do_fragment, types: [BUG] # git bisect bad cd90437399a24ae783b9a3a1a50fe8ee2b717355 Bisecting: 11 revisions left to test after this (roughly 4 steps) [2a2403ca3add03f542f6b34bef9f74649969b06d] tipc: increment the tmp aead refcnt before attaching it testing commit 2a2403ca3add03f542f6b34bef9f74649969b06d gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 25e24db3015639eaa3a1afda9ccfde3414c677192a1a68467700f6865ef7470f all runs: crashed: kernel BUG in ip_do_fragment representative crash: kernel BUG in ip_do_fragment, types: [BUG] # git bisect bad 2a2403ca3add03f542f6b34bef9f74649969b06d Bisecting: 5 revisions left to test after this (roughly 3 steps) [9a6aaf61487e6d96ce0bf9b84a784c528dbf6e5e] net: hns3: Remove the left over redundant check & assignment testing commit 9a6aaf61487e6d96ce0bf9b84a784c528dbf6e5e gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b1ada7c6337b2a6e470e0b8a732a01a7990ae9b9a53e6fe39e82261a2ad3e7ea all runs: OK false negative chance: 0.000 # git bisect good 9a6aaf61487e6d96ce0bf9b84a784c528dbf6e5e Bisecting: 2 revisions left to test after this (roughly 2 steps) [08c27f3322fec11950b8f1384aa0f3b11d028528] batman-adv: initialize "struct batadv_tvlv_tt_vlan_data"->reserved field testing commit 08c27f3322fec11950b8f1384aa0f3b11d028528 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b1ada7c6337b2a6e470e0b8a732a01a7990ae9b9a53e6fe39e82261a2ad3e7ea all runs: OK false negative chance: 0.000 # git bisect good 08c27f3322fec11950b8f1384aa0f3b11d028528 Bisecting: 0 revisions left to test after this (roughly 1 step) [0f6925b3e8da0dbbb52447ca8a8b42b371aac7db] virtio_net: Do not pull payload in skb->head testing commit 0f6925b3e8da0dbbb52447ca8a8b42b371aac7db gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: c5d1322210076f53972ae9fbb9f3c037c0d8aceb5686d8385589682d09ab42bd all runs: crashed: kernel BUG in ip_do_fragment representative crash: kernel BUG in ip_do_fragment, types: [BUG] # git bisect bad 0f6925b3e8da0dbbb52447ca8a8b42b371aac7db Bisecting: 0 revisions left to test after this (roughly 0 steps) [b25b343db0526669947a427e9a31bac91d29bb06] net: broadcom: bcm4908enet: Fix a double free in bcm4908_enet_dma_alloc testing commit b25b343db0526669947a427e9a31bac91d29bb06 gcc compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: b1ada7c6337b2a6e470e0b8a732a01a7990ae9b9a53e6fe39e82261a2ad3e7ea all runs: OK false negative chance: 0.000 # git bisect good b25b343db0526669947a427e9a31bac91d29bb06 0f6925b3e8da0dbbb52447ca8a8b42b371aac7db is the first bad commit commit 0f6925b3e8da0dbbb52447ca8a8b42b371aac7db Author: Eric Dumazet Date: Fri Apr 2 06:26:02 2021 -0700 virtio_net: Do not pull payload in skb->head Xuan Zhuo reported that commit 3226b158e67c ("net: avoid 32 x truesize under-estimation for tiny skbs") brought a ~10% performance drop. The reason for the performance drop was that GRO was forced to chain sk_buff (using skb_shinfo(skb)->frag_list), which uses more memory but also cause packet consumers to go over a lot of overhead handling all the tiny skbs. It turns out that virtio_net page_to_skb() has a wrong strategy : It allocates skbs with GOOD_COPY_LEN (128) bytes in skb->head, then copies 128 bytes from the page, before feeding the packet to GRO stack. This was suboptimal before commit 3226b158e67c ("net: avoid 32 x truesize under-estimation for tiny skbs") because GRO was using 2 frags per MSS, meaning we were not packing MSS with 100% efficiency. Fix is to pull only the ethernet header in page_to_skb() Then, we change virtio_net_hdr_to_skb() to pull the missing headers, instead of assuming they were already pulled by callers. This fixes the performance regression, but could also allow virtio_net to accept packets with more than 128bytes of headers. Many thanks to Xuan Zhuo for his report, and his tests/help. Fixes: 3226b158e67c ("net: avoid 32 x truesize under-estimation for tiny skbs") Reported-by: Xuan Zhuo Link: https://www.spinics.net/lists/netdev/msg731397.html Co-Developed-by: Xuan Zhuo Signed-off-by: Xuan Zhuo Signed-off-by: Eric Dumazet Cc: "Michael S. Tsirkin" Cc: Jason Wang Cc: virtualization@lists.linux-foundation.org Acked-by: Jason Wang Signed-off-by: David S. Miller drivers/net/virtio_net.c | 10 +++++++--- include/linux/virtio_net.h | 14 +++++++++----- 2 files changed, 16 insertions(+), 8 deletions(-) accumulated error probability: 0.00 culprit signature: c5d1322210076f53972ae9fbb9f3c037c0d8aceb5686d8385589682d09ab42bd parent signature: b1ada7c6337b2a6e470e0b8a732a01a7990ae9b9a53e6fe39e82261a2ad3e7ea revisions tested: 32, total time: 6h29m9.204038454s (build: 3h39m13.916796421s, test: 2h35m59.679053731s) first bad commit: 0f6925b3e8da0dbbb52447ca8a8b42b371aac7db virtio_net: Do not pull payload in skb->head recipients (to): ["davem@davemloft.net" "edumazet@google.com" "jasowang@redhat.com" "xuanzhuo@linux.alibaba.com"] recipients (cc): [] crash: kernel BUG in ip_do_fragment ------------[ cut here ]------------ kernel BUG at net/core/dev.c:3260! invalid opcode: 0000 [#1] PREEMPT SMP CPU: 1 PID: 3668 Comm: syz-executor.0 Not tainted 5.12.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 RIP: 0010:skb_checksum_help+0x10e/0x120 net/core/dev.c:3260 Code: 57 ff ff ff e8 43 f7 fe ff 48 85 c0 74 21 8b 75 74 48 8b 95 c0 00 00 00 e9 3e ff ff ff e8 4a fe ff ff b8 ea ff ff ff eb cd 90 <0f> 0b 90 0f 0b b8 f4 ff ff ff eb c0 66 0f 1f 44 00 00 f6 87 82 00 RSP: 0018:ffffc900012e3940 EFLAGS: 00010297 RAX: 0000000000000088 RBX: ffff88810be49a40 RCX: 00000000000074a1 RDX: 0000000000002975 RSI: 0000000000000000 RDI: 0000000000002975 RBP: ffff888108120500 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000080000 R11: 0000000000000001 R12: 0000000000007419 R13: 00000000000005dc R14: 0000000000000000 R15: ffff8881469b7900 FS: 00007fdaba8e16c0(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556be7da8 CR3: 000000010819b000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ip_do_fragment+0x1f7/0x470 net/ipv4/ip_output.c:787 ip_finish_output_gso net/ipv4/ip_output.c:281 [inline] __ip_finish_output.part.0+0xee/0x130 net/ipv4/ip_output.c:303 iptunnel_xmit+0x15a/0x230 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x759/0xae0 net/ipv4/ip_tunnel.c:804 ipgre_xmit+0x17c/0x210 net/ipv4/ip_gre.c:648 __netdev_start_xmit include/linux/netdevice.h:4825 [inline] netdev_start_xmit include/linux/netdevice.h:4839 [inline] xmit_one net/core/dev.c:3605 [inline] dev_hard_start_xmit+0x109/0x2d0 net/core/dev.c:3621 __dev_queue_xmit+0x746/0x9c0 net/core/dev.c:4194 packet_snd net/packet/af_packet.c:3006 [inline] packet_sendmsg+0xac9/0x15f0 net/packet/af_packet.c:3031 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0x2e/0x40 net/socket.c:674 ____sys_sendmsg+0x235/0x250 net/socket.c:2350 ___sys_sendmsg+0x6e/0xb0 net/socket.c:2404 __sys_sendmsg+0x54/0xa0 net/socket.c:2433 do_syscall_64+0x2e/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fdabad5ece9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdaba8e10c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fdabae7df80 RCX: 00007fdabad5ece9 RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000003 RBP: 00007fdabadab47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fdabae7df80 R15: 00007ffdc2066248 Modules linked in: ---[ end trace 5f2765803322b418 ]--- RIP: 0010:skb_checksum_help+0x10e/0x120 net/core/dev.c:3260 Code: 57 ff ff ff e8 43 f7 fe ff 48 85 c0 74 21 8b 75 74 48 8b 95 c0 00 00 00 e9 3e ff ff ff e8 4a fe ff ff b8 ea ff ff ff eb cd 90 <0f> 0b 90 0f 0b b8 f4 ff ff ff eb c0 66 0f 1f 44 00 00 f6 87 82 00 RSP: 0018:ffffc900012e3940 EFLAGS: 00010297 RAX: 0000000000000088 RBX: ffff88810be49a40 RCX: 00000000000074a1 RDX: 0000000000002975 RSI: 0000000000000000 RDI: 0000000000002975 RBP: ffff888108120500 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000080000 R11: 0000000000000001 R12: 0000000000007419 R13: 00000000000005dc R14: 0000000000000000 R15: ffff8881469b7900 FS: 00007fdaba8e16c0(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556be7da8 CR3: 000000010819b000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400